[pstricks] arcangle=nonconstant?

[Bob Tennent]

 >|> I need to compute the arcangle parameter for \ncarc but can't get anything
 >|> except literal numbers to work; is there something I'm missing?  
 >|
 >|\documentclass[12pt]{article}%
 >|\usepackage{pst-node}
 >|\parindent=0pt
 >|
 >|\begin{document}
 >|
 >|\pnode(0,0){A}\pnode(11,0){B}
 >|\makeatletter
 >|\def\psk at arcangleA{ 180 2 div }
 >|\def\psk at arcangleB{ 180 2 div neg }
 >|\makeatother
 >|
 >|\ncarc{A}{B} 

Thanks. This seems to be showing me how to compute in Postscript. I'm
happy enough to do computation in LaTeX because I don't know Postscript.
But either way, I need to do computation with numbers known to LaTeX,
not just constants (180, 2, etc.). Suppose I have the angle I want in a
TeX counter; how do I pass that number to \ncarc (or to Postscript)?

Bob T.